JPH0636629B2 - Gate control device - Google Patents

Description

The present invention relates to a gate control device for remotely controlling an opening / closing mechanism such as a gate or an opening / closing valve in a dam or a weir.

[Conventional technology]

Conventionally, when remotely controlling gates such as dams and weirs, a gate remote control device is installed on the management side, and a drive mechanism for opening and closing the gate is installed on the gate side, and these are further connected via a pair of transmission devices. The remote control device transmits a gate operation command while detecting the current value of the water level and the gate opening, and controls the gate opening so that the actual water level becomes the target water level.

In such a system, if an abnormal operation occurs in the gate remote control device or the transmission device, the gate operation command remains output, resulting in erroneous discharge, which is not preferable.

Therefore, the gate remote control device has a self-diagnosis function added to its main circuit part, and the main circuit part of the transmission device is also described in "Japan Electrical Manufacturers' Association Standard 1337 (established in 1974)". In addition to the above, the transmission abnormality check functions such as "Prevention of double selection", "Traffic congestion, line disconnection and slave station lock", "Sign verification method", "Error verification method" are added to prevent the above-mentioned erroneous discharge. There are things I have taken.

Further, as disclosed in Japanese Patent Laid-Open No. 55-21655, there is a system in which when a periodical control signal is interrupted for a certain time or longer, an operation command is released to minimize erroneous control. .

[Problems to be solved by the invention]

However, the self-diagnosis function or the transmission abnormality verification function is the only measure for the diagnosis or verification, which is the main circuit part only. Due to the complexity of functions, it is not subject to diagnosis or verification. Therefore, there is a problem that it is not possible to detect an element abnormality of the input / output circuit or an abnormality of the input / output signal itself, and as a result, erroneous discharge cannot be prevented. Further, according to Japanese Patent Laid-Open No. 55-21655, there is a problem that an erroneous discharge cannot be completely prevented because the operation command is output once.

An object of the present invention is to provide a gate control device that can completely prevent erroneous discharge.

[Means for solving problems]

In order to achieve the above object, the present invention is an opening detection means for detecting the opening of a gate such as a dam or a weir, a water level detection means for detecting the water level of a dam or a weir, and driving to open or close the gate. A gate control device comprising: a driving means; and a control means that controls the driving means so that the water level becomes a target value based on the data of the gate opening and the water level taken in from the both detecting means, A gate operation command for instructing the start of driving of the gate and a command transmission unit for transmitting a control command of a predetermined cycle indicating that the operation command is in progress from the control unit side to the drive unit side, and the drive unit side. An operation command output unit that outputs an operation command to the drive unit only when both the commands are established is provided.

[Action]

According to the above configuration, the operation command output unit outputs the operation command to the drive unit only when both the gate operation command and the control command of the predetermined cycle received from the command transmission unit are normal. Therefore, when the gate control command is abnormal or the operation command is abnormal, the operation command is not output to the drive means, and the gate is not operated at all.

Further, by disposing the operation command output means at the position closest to the gate, it is possible to reliably detect an abnormality that occurs between the command transmission means and the operation command output means including the control means only by the operation command output means. You can

〔Example〕

FIG. 1 is a block diagram showing an embodiment of a gate remote control system to which the present invention is applied. 1 is a gate remote control device, 2 is a process input / output device, 3 is a gate control arithmetic processing unit, 4 is a fixed cycle. The inversion control command creation unit, 5 is a control signal output unit, 6 is a gate operation command, 7 is a control command, 8 is a transmission device, and the control device 1 and the transmission device 8 are installed in a management office.

Next, 9 is a transmission device installed on the machine side, which is connected to the transmission device 8 on the management side by a predetermined transmission line, 10 is a protection device, 1
1 is a control command reversal signal reception verification unit, 12 is a control signal verification / opening / closing signal output unit, 13 is an operation command, 14 is a machine side panel for opening and closing the gate, 15 is a gate operation circuit, 16 is a gate overoperation verification circuit , 17 are gate state display output circuits, 1
Reference numeral 8 is an opening gauge, and 19 is a water level gauge. The gate G is opened and closed by a gate motor M which is driven by a gate operating circuit 15 to drive an electromagnetic switch Mg and which is turned on to turn the contact.

FIG. 2 is a block diagram showing a detailed configuration of the control device 1, the transmission devices 8 and 9, and the gate control arithmetic processing unit 3, the control command generation unit 4, and the control signal output unit 5 of the control device 1 are microprocessors. And its peripheral circuits,
The calculation of the gate opening amount and the control of sending the gate operation command and the control command are executed by the program processing of the microprocessor. On the other hand, the process input / output device 2 includes a control unit 20 and a plurality of output circuits 21 that output gate operation commands and control commands. Also,
The transmission device 8 on the management side has a plurality of input circuits 2 for operation commands and the like.
2, a transmission controller 23, a P / S converter 24, a modulator 25
The operation control command and the like received from the process input / output device 2 are received by the input circuit 22, and then the transmission control unit 23
Is selectively input to the P / S conversion unit 24 under the control of
The P / S converter 24 converts the data into serial data, and the modulator 25 modulates the serial data with a carrier having a predetermined frequency and sends the serial data to the transmission line 31. The transmission device 9 on the gate side includes a demodulation unit 26, a reception control unit 27, an abnormality detection unit 28, an S / P conversion unit 29, and a plurality of output circuits 30, and a signal received from the transmission device 8 is demodulated by the demodulation unit. 26
After being demodulated by S / P under the control of the reception control unit 27
The data is input to the conversion unit 29, converted into parallel data by this S / P conversion, and transferred to the protection device 10 via the output circuit 30. If there is an abnormality in the signal received from the transmission device on the management side, the abnormality detection unit 28 detects this and outputs a transmission device abnormality signal to the protection device 10 to cancel the operation command for the gate.

FIG. 3 is a block diagram showing a detailed configuration of the protection device 10, which includes a relay OP operated by an operation command from the transmission device 9 indicating “gate opening” and an operation command indicating “gate closing”. A relay CL that operates and a relay B that operates according to a control command of a predetermined cycle that indicates that an operation command is being issued.
And a timer T _{1 of} time t that is driven when the relay B is in the on state, a timer T _{2 of} time t that is driven when the relay B is in the off state, and both of the timers T ₁ and T ₂ are off. A relay C that operates at times, and outputs a gate operation command from the ON contact of the relay OP or CL to the gate operation circuit 15 only when the relay C is operating, and selects one of the timers T ₁ and T ₂ . When one of the timers is up, the relay C is turned off and the operation command is released. The relays B and C and the timers T ₁ and T _{2 form} a control command reversal signal reception verification unit 11, and the series parallel circuit of the ON contacts of the relays OP, CL and C includes the control signal verification / open / close signal output unit 12. I am configuring.

In the above configuration, when controlling the opening degree of the gate G, the arithmetic processing unit 3 first transmits the signal of the current opening degree and the water level of the gate G detected by the opening degree gauge 18 and the water level gauge 19. 9 and 8 are read via the process input / output device 2, and signals of the gate state detected by the gate state display output circuit 17 are read via the transmission devices 9 and 8 and the process input / output device 2. If the gate G is in a normal state, the operation amount of the gate G with respect to the target water level is calculated based on the signal of the current opening and the current water level, and the operation command of the time width corresponding to this operation amount is output as the control signal. Input to part 5. Then, the control signal output unit 5 forms a control command having substantially the same time width as the operation command received from the arithmetic processing unit 3, and inputs this control command to the fixed period inversion control command creation unit 4. Creation department 4
Converts the control command received from the control signal output unit 5 into a control command that repeats on / off at a predetermined cycle t and inputs the control command to the process input / output device 2. The process input / output device 2 transmits a control command 7 which is an ON / OFF signal of a predetermined cycle together with an operation command 6 having a time width corresponding to the operation amount of the gate G and transmission devices 8 and 9.
To the protection device 10 via. Then, the protection device 1
At 0, the relay B is turned on / off by the control command 7 having the predetermined period t, and the timers T ₁ and T ₂ are driven alternately. At this time, the control command 7 is normally turned on / off at the time period of t.
If it is off, the driving of the timers T ₁ and T ₂ is interrupted before the time is up, so that the relay C continues to be in the on state. Therefore, from the ON contact of the relay OP or CL having the ON contact of the relay as a common, the gate operation command 1 at the time interval corresponding to the ON time of the relay OP or CL.
3 is output, and the gate G is operated to the open side or the closed side while the gate operation command 13 is output. However, when an abnormality occurs in which the ON or OFF time of the control command 7 exceeds t time as shown by the broken line of the time chart in FIG. 4, the timer T ₁ or T ₂ is timed up (shaded line in FIG. 4). Part). As a result, the relay C is turned off, and the "open" or "close" operation command 13 for the gate G is released.

Therefore, when some abnormality occurs on the transmission path of the control command 7 up to the protection device 10 and the control command 7 does not repeat ON / OFF for a predetermined period t, the operation on the gate G is released. Therefore, it is possible to completely prevent erroneous discharge due to all abnormalities of the transmission system including abnormalities of circuit elements.

In the above-mentioned embodiment, the case of controlling the opening / closing of the gate of the dam has been described, but the same can be applied to the case of controlling the opening / closing valve of the discharge channel.

〔The invention's effect〕

As described above, according to the present invention, a gate control command and a control command of a predetermined cycle indicating that an operation command is being issued are output, and the gate operation is executed only when both commands are normally established. With this configuration, if any abnormality occurs in the operation command system, the operation of the gate is immediately released, and erroneous discharge can be completely prevented.

Further, by disposing the operation command output means at the position closest to the gate, it is possible to reliably detect an abnormality that occurs between the command transmission means and the operation command output means including the control means only by the operation command output means. Therefore, it is not necessary to provide an abnormality diagnosing function for each input / output circuit such as a transmission device, and the system can be simplified and the reliability can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a gate remote control system to which the present invention is applied, FIG. 2 is a block diagram showing a detailed configuration of a gate remote control device and a transmission device, and FIG. 3 is a detailed configuration of a protection device. And FIG. 4 is a time chart for explaining the operation of the embodiment. 1 ... Gate remote control device, 2 ... Process input / output device, 3
... gate control arithmetic processing unit, 4 ... periodic reversal control command creation unit, 6 ... gate operation command, 7 ... control command, 8,9 ... transmission device, 10 ... protection device, 11 ... control command reversal signal reception verification unit, 14 ... Machine side panel, 15 ... Gate operation circuit, G ... Gate.

Claims (3)

[Claims] 1. An opening degree detecting means for detecting an opening degree of a gate such as a dam or a weir, a water level detecting means for detecting a water level of a dam or a weir, a driving means for opening and closing the gate, and both the detecting means. A gate control device including a control means for controlling the driving means so that the water level reaches a target value based on the data of the gate opening and the water level fetched from the means, and instructing to start driving the gate. Command transmission means for transmitting a gate operation instruction and a control instruction of a predetermined period indicating that the operation instruction is in progress from the control means side to the drive means side, and only when the drive means side establishes both the instructions. And an operation command output means for outputting an operation command to the drive means. 2. As the control command, a control command indicating that an operation command is being issued is input to a fixed-cycle inversion control command creating unit provided on the control means side, and the command is turned on / off at a predetermined cycle. The gate control device according to claim 1, wherein the gate control device is created by converting into a control command for repeating. 3. The operation command is determined in a predetermined manner by verifying whether the control command received from the control means side is turned on / off at a predetermined cycle in a control command inversion signal receiving section provided on the drive means side. The gate control device according to claim 1, wherein the gate control device is output only when it is turned on / off in a cycle.